Talking machine



June 28 19279 1,633,745

I. JACOBSOHN TALKING MAQHINE Fil ed May 29. 1924 HI!!! HHHHII H i7 4 I I I'm. A l

frwz'zziam- Patented June 28, 192?.-

errso STATES PATENT OFFICE. 7

I ISAAK JAGOBSOHN, F SPANDAU, GERMANY, ASSIGNOB TO BRUNO MULLER, OF

I GOBLITZ, GERMANY.

TALKING Macrame.

Application filed-May 29, 1924,

This invention relates to a talking machine ot the kind in which a record is used composed of an endless, flexible steel'band having on its edge a magnified reproduction of the sound waves, the band being strung over pulleys whereby it is moved under the sound-reproducing needle.

- The invention consists in the provision of a coiled recordband and of a double-pulley whose one part is used for guiding the band from the inside to the outside of the coil.

By this arrangement a record of considerable length can be employed without detrimentally aflecting the feeding of the band and without involving difficulties in the exchange of bands.

' The invention is illustrated in the accompanying drawings by a perspective view of the talking machine.

The record is taken on an endless band 6 of polished steel into the edge 8 of which a magnified reproduction of the sound-waves is engraved by etching or the like. The band i is coiled and strung on horizontal, distanced pulleys whereby it is fed for vibrating the sound-reproducing needle, the pulleys being mounted in ball-bearings. One pulley 3, which drives the the band, is arranged on a level with a guide pulley 2. A third pulley 3o 4 is superposed on and connected to the pulley 3. This latter pulley serves to guide the band 6 from the inside to the outside of the coil,- as shown in the drawings. Deflecting rollers 7 'and' 7 are employed for preventing contact of the transferred stretch with the rest of the coil at the crossing point. There is also a pulley 5 connected to the pulable the band to project above it.

serial No. 716,789, and in Germany June 2, 1923.

ley 3 for transmitting motion to the same in any desired manner. 1

The pulleys are mounted on a base 1 which 40 also carries the sound-box 9. The vibrations are not picked up direct by the needle but by a blade spring 10 which bears against the edge 8 of the band at a point where the single stretch passes round the pulleyfl, the latter being made sufficiently narrow to en- The sound-box is held horizontally between pivot points 12 and 12 so that it can rock in a vertical plane. A spring 13 pulls the box and holds the needle point against the blade spring 10 so as to transmit the vibrations of the latter to the sound-box diaphragm. The

trumpet 11 is connected to the sound-box in the usual manner and is guided in a yoke 14.

I claim In a talking machine of the character described, the combination with a sound reproducing needle and with a: record carrier composed of an endless travelling steel band having the record on one edge, .ofa pair of distanced supporting pulleys on which the band is wound so as to form a coil having.

a plurality of strands, a deflecting pulley arranged coaxially with and connected to one '65 of said supporting pulleys so that it can be usedgfor transferring the band from the inside to the outside of the coil, said deflecting pulley being made narrower than the band so that the record edge of the latter will be held in a projecting position relative to the same, for contact with the needle.

' Isaak JACOBSOHN. 

